bignumber.js.ts

import BigNumber from 'bignumber.js';
import { CustomParse, CustomStringify, parse, stringify, StringifyType, TypedValue } from '../src/index';

type MyType = StringifyType | 'BigNumber';

const customStringify: CustomStringify<MyType> = (obj) => {
	if (obj instanceof BigNumber) {
		return { useResult: true, result: { t: 'BigNumber', v: obj.toString() } };
	}
	return { useResult: false };
};

const customParse: CustomParse<MyType> = (obj) => {
	const { t, v } = obj as TypedValue<MyType>;
	if (t === 'BigNumber') {
		if (v === undefined) {
			throw new Error('No value');
		}
		return { useResult: true, result: new BigNumber(v) };
	}
	return { useResult: false };
};

const obj = {
	a: 'hello',
	b: [new BigNumber(1), new BigNumber(2), new BigNumber(3), new BigNumber(4), new BigNumber(5)],
};
console.log(obj);
/*
{
  a: 'hello',
  b: [
    BigNumber { s: 1, e: 0, c: [Array] },
    BigNumber { s: 1, e: 0, c: [Array] },
    BigNumber { s: 1, e: 0, c: [Array] },
    BigNumber { s: 1, e: 0, c: [Array] },
    BigNumber { s: 1, e: 0, c: [Array] }
  ]
}
*/

const s = stringify(obj, { customStringify });
console.log(s);
/*
{"a":{"t":"string","v":"hello"},"b":[{"t":"BigNumber","v":"1"},{"t":"BigNumber","v":"2"},{"t":"BigNumber","v":"3"},{"t":"BigNumber","v":"4"},{"t":"BigNumber","v":"5"}]}
*/

const d = parse(s, { customParse });
console.log(d);
/*
{
  a: 'hello',
  b: [
    BigNumber { s: 1, e: 0, c: [Array] },
    BigNumber { s: 1, e: 0, c: [Array] },
    BigNumber { s: 1, e: 0, c: [Array] },
    BigNumber { s: 1, e: 0, c: [Array] },
    BigNumber { s: 1, e: 0, c: [Array] }
  ]
}
*/